Hydraulic press



` F. S. KOCHENDORFER.

HYDRAULIC PRESS.

APPLICATION FILED APR. 13. |918.

Patented June 24, 1919.

a simple,

UNITED sTATEs PATENT oEEIcE.

IFIBEIIDIRI l S. KOCHENDORFER, OF CHICAGO, ILLINOIS, ASSIGNOR TO ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION 0F NEW YORK.

HYDRAULIC PRESS.

Application led April 18, 1918. f Serial No. 228,401.

To all whom z't may concern:

Be it known that I, FREDERIC S. KOCHEN- DoRr'ER, a citizen of the United States, reslding at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hydraulic Presses, of which the following is afull, clear, concise, and exact descriptlon.

This invention relates to hydraulic presses, and more particularly to steam operated hydraulic presses in which a body of water beneath a movable ram is operated upon by a steam drivenpiston to move the movable ram against a stationary ram.

In presses of this type there. is acertam amount of leakage of water from the cham- .ber below the movable ram, and in order to ,insure that each stroke of the movable ramv shall be uniforml and of the same pressure as the receding stroke, it is necessary to replenlsh the water lost by leakage before .the beginnin of each stroke in order to br1ng the mova le ram to a predetermined level.

The object of this invention is to provide economical, and eiiicient means for automatically controlling the replenishment of the water under the movable ram at the end of each stroke of the ram.

In accordance with the general features of this invention, there is provided controlling means operated automatically'by the movable ram when it drops below a predetermined position to control the flow of water into the chamber below the movable ram. This ispreferably accomplished by means of a valve in a water inlet pipe, leadin' to a low pressuresu ply, which is control ed by means of a p unger connected with the movable ram. When the ram is below a normal predetermined position the plunger is caused to open' the valve in the inlet pipe which permits the water to flow into the chamber below the movable ram until the ram is raised to its normal position, when the valve in the inlet pipe is closed.

In accordance w-ith another feature of this invention, the plunger controlling the supply valve in the water inlet pipe 1s adapted to be moved laterally away from the valve to permit the draining of the chamber beneath the movable ram when desired. Preferably the plunger is provided with a hinged portrating the resi mally tends to move the sli e tion whichl is normally acted upon by resilient means to hold it in operative relation to the valve in the inlet pipe, but which resilient means permits the hinged portion to be swung laterally out of engagement with the inlet valve.

In the drawings illustrating this inventiony Figure-1 is a view in front elevation, with parts in section, of a steam hydraulic press embodying the features of this invention;

Fig. 2 is an enlarged detail view with the valve controlling plunger ,in section, illusient means vfor permitting the disengagement of the plunger from the inlet valve, and

Fig. 3 is a detailed elevational view of the parts shown in Fig. 2.

As shown in Fig. 1, 5 designates a movable ram reciprocally mounted. within a chamber 6 containing water 7 and adapted to be moved through the agency of a steam controlled piston 8. Water issupplied to the chamber 6 through an inlet pipe 9 Within which is a valve y10 and a high pressure check valve 11the latter valve being provided for the purpose of preventing the water being backed up into the supply pipe when the piston 8 is operated.

The valve 10 is provided with a bell crank lever 12 adapted to operate upon al plunger justably supported a rod 16, the lower endV of which is normally in engagement with the bell crank lever 12 of the valve 10.

The rod 16 is provided between its ends with a hinge 18 which permits the lower end ofthe rod to be swun the lever 12. .A guide 19, through which the rod 16 extends, is secured to the frame of the press above the hinged portion 18, and a second guide 20 is secured to the frame ofthe press near the lower end of the rod 16 and below` the hinge 18. The lower guide 20 comprises a Slide member 21, one end of which bears against the rod 16, the other end being engaged by a sprin 22 which nor- 21 and the rod 16 into engagement with the lever 12. This closing laterally away from g spring, however, permitsl the rod 16 .to be swung laterally awa from the lever 12 when it is desired to rain the chamber 6.

The operation of this invention is brieiiy as follows: I

When the movable ram 5 is operated in response to the operation of the vpiston 8 and the piston 8 is withdrawn to its normal position, the ram 5 will drop downwardly carr ing with it the rod 16 which, as it engages the lever 12, will open the valve 10 to permit water to flow into the' chamber 6 beneath the movable ram. As the water flows into the chamber 6 beneath the' movable ram 5 it gradually raises this ram and with it the rod 16 until the ram is raised to its normal operating position, when the ressure of the rod 16 upon the lever 12 will e` relieved and the valve 10 will be closed against further flow of water. It has been found that the water through the feed pipe 9 may be supplied from any suitable low pressure source which is just sufficient to raise the ram 5, thereb making it unnecessary to use expensive high pressure pumps or other apparatus.

When 1t is desired to drain the chamber 6, the lower end of the rod 16 will be swung laterally out of engagement with the lever 12, thereby permitting it to slide past the lever 12. A drain pipe (not shown) may be connected with the chamber 6 in any suitable manner and provided with a valve which will permit the drainage of the cylinder, or

the cylinder ma be drained by removing the gland at the ower end o the chamber 6. The operation of the piston 8 is controlled b means of a throttle valve 25 which may also control the draining of the chamber 6.

What is claimed is: i 1. In a hydraulic press, a movable ram, a

amount of water supplied to, said chamber.

a feed pipe lungen-carried by said 2. In a hydraulic press, a movable ram, a

water chamber beneath' said ram, a water supply p1 e, a lvalvein said pipe, a plunger controlle by said ram for controlllng said valve, and means for permitting the disengagemen tof said lunger from said lvalve. 3. In a hydraulc press, a movable ram, a wate` 'hamber bleneath sad ram, alwater supp y p1 e, a va ve 1n sal p1 e, a4 er controlledp by said ram for colitrolliggmid valve, and resilient means for permitting the disengagement of said vplunger from lsaid valve.

4. In a h draulic press, a movable ram, a water cham er beneath said ram, a low pressure water supply for. supplying water to said ram, and means. controlled by the movement of said movable ram for admitt' water from said low pressure source to sai chamber to raise said ram `to a predetermined level.

5. In a hydraulic press, a movable ram, a. water chamber beneath said ram, a supply pipe leadingfrom a low pressure water su ply source to said'chamber, a valve in sald suppl pipe, andmeans controlled by said mova le ram for controlling said valve to admit water from said low pressure supply to said chamber to raise the ram to a predetermined height.

In witness whereof, I hereunto subscribe my name this 27th day of March A. D., 1918.

FREDERIC s. KOCHENDORFER. 

